Sectional-pin insulator.



S. S. SONNEBORN.

SECTIONAL PIN INSULATOR.

APPLICATION msn JuNEz, :911.

1,290,673. Patented 1311.7,1919

3 nvm/woz SOL S. SONNEBORN, 0F BROOKLYN, NEW YORK.

SECTION'AL-PIN INSULATDR.

Specification of ALetters Patent.

Patented Jan. 7, 1919.

Application led June 27, 1917. Seria1 No. 177,179.

To all whom t may concern:

Be it known that I, SOL S. SONNEBORN, a citizen of the United States,and a resident of Brooklyn, county of Kings, and State of New York, haveinvented vcertain new and useful Improvements in Sectional-PinInsulators, set forth in the following specification.

This invention relates to high potential insulators. The 'general objectof' the invention is to increase the dielectric strength of an insulatorwit-hout the provision of an excessive 'amount of insulating material.To this end the insulator is constructed in the nature of a condenser sothat its dielectric strength against puncture shall be approximatelyproportional to the combined minimum thickness of its insulating wall.More specifically the object of the invention is to cheapen and improvethe manufacture and maintenance of a high potential insulator of thecondenser type. One advanf tage of the invention lies in the fact thatanyone of the plurality of sections of which the insulator is made upmay be separately renewable in casefof breakage without the need ofrenewing the entire insulator.

The above and further features of the invention are specified inthefollowing claims, which are directed to the invention in 'any of itspossible embodiments, of which illustrative embodiments are shown in theaccompanying drawings which form a part hereof, in which v likecharacters designate corresponding parts in the several ligures and inwhich Figure l is an elevation of an embodiment of the insulator withone-half shown in vert-ical section; Fig. 2 is a vertical section of oneform lof connecting ring; Fig. 3 is a plan view of a modified connectinring; and Fig. 4 is a vertical section of t e connecting ring shown inFig. 3.

The nestin sections of this insulator may be formed o any suitableinsulating material, vi-trified, such as'porcelain, or mo-ldable, suchas electrose, although it is to be understood that the design hasparticular advantage for construction out of vitriied ma- The insulatoris shown built up out although the numterial. 'of three nestingsections,

ber of sections may be practically whatever Y desired within the limitsof the structural strength of the material of which they are made. Thebottom section 1 has an internal screw-threaded pin cavity 2 and a topportion 3, substantially frusto-conical in shape,

a portion of which, preferably the lower portion, having screw threads 4formed circumferentially about it. l

The section to nest upon the section 1 has a cavity the contour ofwhich-fits as eX- actly as possible upon the under section and hasinternal screw-threads 5, loosely mating with the screw-threads 4 'ofthe under section. This looseness between the two threads 4 and 5 shouldbe considerable and at least greater than the maximum structuralirregularities incident to insulator construction. The union betweenthese two threaded portions is eifected through the medium of a fillerring A, which in the embodiment of Fig. 2, is a spun l having ahorizontal flange 6 and a collar 7, corrugated into screw-threads. Inthe em'- bodiment shown in Figs. 3 and 4, a ring A1 is identical withthat of Fig. 2, except for the provision of alternating slo 8, extendingthrough the flange 6 and upwardly into the collar 7, and slots 9extending from the top of the collar '7 downwardly between the slots 8.By the provision of these slots 8 and 9, the ring is made up out of aplurality of highly resilient lips 10 and 11. One of the rings A or A1is screwed over the threads 4 and due to this resilience adapts itselfto the irregularities of'the structure. A superposed .section is thenscrewed home over the ring 7, which yields to the irregularities of thescrew threads 5. In this way the union is solely from porcelain to metaland not from porcelain to porcelain. The flange 6 :fits between theledges 12 and 13, completing the separation of the two nes ing porcelainparts.

The interlocking construction between the intermediate section 14` andthe top or conductor section 15 is substantially identical with thatbetween the pin section 1 and the intermediate section 14, similar ringsA2 and A3 being employed in both cases.

In order to give a condenser action to the sectional insulator, theientire uppersurface of the conductorV section 15 is provided with acovering 16 of conducting material such as metallic paint or a closelyfitting covering of spun sheet-metal or a metallic coating applied andfired into the porcelain in accordance with the practice in ceramics. Inaddition, every mating surface of every section is likewise providedwith a similar metallic covering so that when two sections are nestedtogether these two metal coverings,

sheet-metal structure ing Nvhlch,

as for example l? for the conductor section l5 and 18 for theintermediate section lll, contact at many points. By these two-foldcoverings, which are substantially in electric connectionthroughouttheir extent, mechanical injuries which might aect onecovering will probably be bridged .by the other coverat that locality,is intact. lin this way a substantially continuous metallic partition isinsured. rllhe pin cavity and preferably the entire inner cavity of thepin section l is likewise provided with a similar metallic coating i9.

What is claimed and what is desired to be secured by United StatesLetters Patent 1s:

1. A high-potential insulator of the condenser type comprising aplurality of nesting sections of insulating material having nestingsurfaces; a nesting surface of one or more of said sections having anadherent covering of conducting material; overlapping portions ofadjacent nesting sections being provided .with loosely mating screwthreads; and a filler ring of resilient sheet material threaded to fitsaid screw threads on said sections of insulating material and permitthe same to be screwed together safely despite irregularities in saidthreads.

2. A high-potential insulator comprising a plurality of separablesections of insulating material nesting one upon and within. another;overlapping parts of adjacent'sections being provided with integrallyformed .separable Leaders causing said loosely mating threads tocooperate Vthrough it as a medium.

3. A high-potential insulator of the pin type and having condenserqualities comprising a plurality of nesting separable sections ofinsulating material, a pin section having a pin cavity and aconductor-section; one or both of the nesting surfaces of said sectionsbeing provided'with a covering of conducting material; meeting faces ofadja cent sections having coperating threads involving both lsaidsections of insulating material and each ofl their said coverings ofconducting material; a covering of conducting material for the walls ofsaid pin cavity; and a covering of conducting material for the topsurface of said conductor section.

4f. An insulator comprising a plurality of nesting sections of vitreousinsulating material mutually provided externally' for a lower sectionand internally for an upper section with coupling irregularitiescooperating upon relative rotation of said nesting sections; and ametallic plating formed on one or both of the nesting surfaces ofadjacent sections and coating the said coupling irregularities.

ln witness whereof I have signed my name to this specification, this12th day of June,

SOL. S. SONNEBORN.

